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Zeeshan Ahmer
Abstract
An investigation on thermomechanical behaviour of a tool steel X38CrMoV5
Zeeshan Ahmer - 19 December 2011
Hot work tool steel X38CrMoV5-47HRC is mainly used in industrial
manufacturing processes such as high pressure die casting, hot
Forging, stamping and rolling etc. The tools should comprise
high fatigue strength as well as high toughness to defy thermal
and mechanical shocks. The tool's Surface is principally ruined
by the cyclic and progressive process under ephemeral
temperature i.e. the process of non-isothermal fatigue. The
appropriate constitutive laws are therefore required to predict
the behaviour of material under non-isothermal conditions.
This thesis depicts a contribution to predict the mechanical
behaviour of X38CrMoV5-47HRC by numerical simulations using
constitutive behaviour models. Assessment of the robustness and
limitations of a Chaboche type thermoelastoviscoplastic model is
carried out under several different test conditions starting
from several uniaxial tests (LCF and TMF) to complex loading
conditions with variable transient temperature range and
variable amplitude of mechanical strain. After characterization
of the model under the said conditions, its parameters have been
re-identified in order to update the model to work under complex
loading conditions. Keeping in view the model's limitations,
further directions are also discussed in order to improve the
model in terms of its application under severe loading
conditions.
Keywords: Tool Steels, TMF, LCF, Constitutive Behaviour Model, Numerical Simulation
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